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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce68bd84c5a2b037af55fdaa65e045bcf09add887a392e0f021e6fd25535563e' 
  AND token = 'LoP+pu8j24xX1wKlOoJudI2xvsO9L0cJ2+XwbUpqiUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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