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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '145d51ff7d6ddd39df5c8154c67df274c299135cfa311210b6960ecd350c0c7e' 
  AND token = 'NUw/w0e46no1abrxvJJnjcAwoNlczZWsdd0bTlW3p7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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