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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3096cd33505a09eb2c74301045c603784603070486b39c6b6b5dd9a8c8aede3e' 
  AND token = 'ffyRkDK+UQ5Ph2yTZpOifZE/PnJAFmVss99oRq/PzUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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