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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3ce1c50d26c6c8a117b8ea96c13cdf1ad359fa26c63ecd81869bd1202864156' 
  AND token = 'k1akMeWEeT1YkE4M/oqgVxapIpolqlBhC41PFXlD1Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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