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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efcc46267243740be0952d6e4f0b0958b2a2138918340318a6051b020598b25a' 
  AND token = 'LV4ZTcKWzo9y/lKOftmJ7OOs3EhMGiZnZ1Rk9vnQz6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}