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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c54b45a475f4fc46c051400dd5e19b0a4a09774b77b656eb973cf7cb22af8ebb' 
  AND token = 'od+BAlNvSyGVScWpokmVtwoWL2N8H490YqU0oEmX0Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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