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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c58516443428758a31b8ab1911bf1cce87aee825d30f55b416aa1e9795dac656' 
  AND token = 'GGi1qt+Ep+kw9HTQ3CqK7Mvqx2ngC60C8miQKqIdDro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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