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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ccf03d60d159f85001b8144daf8ae15f8f9eb6c067a10fe3e4aac82d1cec095' 
  AND token = 'fTMNtRzbmVtCyHPlFf08YKfXur4JIEphA8N2KFiA3iM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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