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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08fd4dcc5c186e1481f092112769da12fd61ce09f97c3b9b499d764dcd733d5' 
  AND token = 'M8Dfb4CUuT1sjBRG0e/D35orE4/PkXa41hyiIR2uU0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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