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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93d367f27731122f92488f9ee5ba8a3e1c4d4bef387ed9af20d5d477f5a7d8f9' 
  AND token = 'E9BTSR6KVo7/Vh5dMgjz1sriZ0jGaXN0ZOf2JoOdOtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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