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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1da4c7ca093ae892249bd994c14a9c7d9437b4e199d298782294e5e3050c2bc' 
  AND token = 'mEpMqcz5NmFDwSLpgr3uYVP/ij0TgjGXMyHZw7u+Tlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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