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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff518cd6bd3cf7e5319af005b290a44c7f76daaf20e452bf0f8e03a5e9c76581' 
  AND token = 'rs4Ch7vaM5yauDk5sKwlwJdHWV8S2T2hI6s5WCRHNZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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