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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '459ab6aed8d814db86d7c8dcb6db1486fe348bf4ed6688856ed01e1aed74d64c' 
  AND token = 'bEqrclm1C51u+4D8VJLctd5x4X41b1HUrOqwF/Cqc80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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