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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fc04e67092f74459923f8f6f263b407cc57798d91e029a02f7794cec63f9529' 
  AND token = 'fRzORA7hGPE72jIAkhZ55XPrKBkEV1Io9Ki7FwIZsNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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