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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57986d8e40bb571bc2940ef04d91a7b28585b0e52b21658913eb22e2b300144e' 
  AND token = 'JsN8U/9xw4arxPVeVf/xGsEQmQVN4vqcByWlIqpkTFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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