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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4449c7d0345bda195e17f72245af5ff67f1d4dd23d4ee2aae63e022fabf2b75' 
  AND token = 'a9STKCbpU2eSJmBhQNDkhXuw6A7+t+G/Z681XxIxlqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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