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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36073c874aa59bd5095de8dc35864b742e754ef7d12cc824e0cdccb6948a7523' 
  AND token = 'MJztkr2cnAchLzoBH2JOZbwLviie4j00bgjCJmUQJvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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