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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba929eb53e74a8ff8b78b3700932731829aa50e66928c4bb22f04711f6940941' 
  AND token = 'HDAtl6hrVapWx91cOibbY1coVjXx1JlSCcv+jbfD4zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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