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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0ea2b992a7b5f4df252adb609938dfb08ed04c80c1cebf968138e37d3b1452a' 
  AND token = 'uhtNrfHF7f75RI5qVtN1iXUhsgBUESoWdW6upUVslqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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