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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5501ceb06b0935bc93730b744361301234ea2c2a97d2174fd6986562543134eb' 
  AND token = 'iSbd5eFAuCZvrLRmsCB2jk+IiuPNq5MXBhHhI79dYKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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