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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d5568557936d042fca1b7b1c6c615f78147a72f733041b3d8750cd48ea89e3' 
  AND token = '1qsSKST1uRJT+976TcFodZGX5F7mKf7NLwBCMbxThXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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