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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c04371ab190254899f87c2842cccfebd02cc099a741d03a913c2e5305837d24' 
  AND token = 'J+/MllOfVI7ZRnRQ106ywzrc/SuD7HP4KLR/G81+KH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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