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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8bf005b774973fa16c8410116cce97e9c9b76a59ed9952c397a6a933096bfab' 
  AND token = 'q4Z2E2xca48Y6Zlaca+NyNgO8fNwRf5Io8AzMNEZN6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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