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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b642e42d1f49d519a69cffc3ff317f67da2c5056a82cd561fc1d86d76485d7ef' 
  AND token = '7QQIFgcbqDrbIaoDR23a0PFs0Fd0nigP1rQGBd6rEfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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