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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e15012ae93ccb8428edb56cb929056594a260ff1ff70bc4e0685ce5787eba2e8' 
  AND token = 'wv7wwQBNQesSHknB0PpXvu4NFdX0iE8dNl3+hWF8a14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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