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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6419ff3ba0f7e9e002826e336f365af08720f18511f07665cafe0da67103839' 
  AND token = '9QWNFcPAAX0U0NCtJQ1UOEFiL6KURdm4O2Eb0/Mvl9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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