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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41786681620916339b6216fe24d5c2b514d06b2f18243641e9a2c0342ad7fac8' 
  AND token = 'wndgTk8qUHYPq02dtzN4Tp0rNsXGjxDgoaT7UceJrp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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