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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '316e35f3ffab2fbd40508bee1acd050e34f72b24c1b60b86638ac55a72c7394d' 
  AND token = 'kScUKosZud3Xfl7GHS004OMkL0mp0KzlUyh2HZzJeX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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