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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b83d6524d4254d5ffd83dfc3b0d5dff7b8f1676ec24533d9d86aadd7be0723' 
  AND token = 'hqL1uK5JUa0qt5fpLJwyh6Tx52oCryyjeT11Ot0NODE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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