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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aef990df933eb445cf7fa2d9ec6737e2ae8f7dd0fd5a75c4b17171edf970af02' 
  AND token = 'e3S9Uak6qIym/zrcJph8GFEY3ucSsTbsk18+xirqPp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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