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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4108915e321be4885a8eebd2193410508e8e3de30a6279842988b2513bedba30' 
  AND token = '112e0npoO1mPJd3n2k/HREASJ4ehclmpHKcVi2LHW1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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