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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0db5a04998add26f41c1e445b4e224429db9d133d61b89b11c020c7bc0965e0d' 
  AND token = 'vZpBjPr3odRvoVOUeX8kzwISU/aBLVYemOqyE8eABgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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