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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df306199d7aa475e18a50fc38d7c140ba59a0d2fe4b16c8a44c2038a731750ef' 
  AND token = 'sdd7OPw/3+w8SAPYmhVz99u4cRtr9TwdcyAKxkHG/aY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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