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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb4a9f185b18009c36ab0736ee439ae86d71c40bd2828508b7dd3935ea32e8b6' 
  AND token = '7V3ilwk4N83/+L4/NJz9y7iw5R3KlVedPhy8cv5kYgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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