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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e75440745732c625e558db486d4fd205cffe3458a17700dfe05725d37518a71a' 
  AND token = 'X5GbmNDnZRSaVdH0yIcqq6K6P/ix/YMiIWb4PNGx56k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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