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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '069b074ebb769726ba5cd40e9a424c9952f4023ac0d1daf23aaed90269b57675' 
  AND token = 'ixWBEgjBZ2/Gcu2craR9bCkUkeeP6PmyvuaAJt6cQFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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