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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12f7ba7e2210326ce075a99a0956de9d5476a0e83f1343e9e499ace8291d6ebf' 
  AND token = 'IbohdQW/RI1MJYnbf1iN69rIkKOtf2adhDKsoLzTCXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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