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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f50a06be558a124c91157e2942a2aebd86f62967b530f67daf45d8d30e86d229' 
  AND token = 'W4OoHIkbNOwveucvOCkwK/SP1WvnFodnLQsVO2h5m2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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