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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95122b9673d7d45df28289d958f0d99259ea485b750e53a4633b4d5ae0c3571f' 
  AND token = 'Jfms4dQc3CH1aShyGk3FyQRmzsRhkHcZurfxyBu5E1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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