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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc97d6cdb03c4c66fbc19108a00d794ced2b1ff250051dcf49bcca8b7eeb2947' 
  AND token = '6rKNc0reCYq0UVAWLV49hilIxoEcb5AjRq0CmGWf2go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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