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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0807d5ad7181fe106c7bfb6c78767456de021a2f86326540c65d739124ba2c36' 
  AND token = 'mL47O75caHh5Yo5J0THKMMZbXXT37WltuQMZNNIzT9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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