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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e59b36d9da0079bb65b3bf25d2bf8e8a9df46352845465a1c6d97492af628f9e' 
  AND token = 'L9ufc6EbIJcVjBu9g2JPiompMpowH8RFEwIct7u2+lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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