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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b4514366d4d0930d27a3a81b4564b8803b21464f35c7a979f237e073f5cfb4b' 
  AND token = 'SconNNKDFzzEt2YZWamLT8rKaUAbxNg7H935glnGIqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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