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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63cb75b0cb67c853ca7a8ab637a22b7962611990195cc96ed7196618a59b14e0' 
  AND token = 'h923CJ5Yw1Xnr/QO8mJzJONmesJqAffUAc3Q17q9f74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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