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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5856168d8a1b4f7d9f3d9744a23fad0e0d9bc4e8118f0a31eb0ee76c656c31bb' 
  AND token = 'PTIwbpc3CMaEPBDFtClcLZIlEAtVgnXRE5Ho3u06NE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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