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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08d34a62b954362ca241ab409f7394b84989da8aaa8ec4b3f826e422509ee60c' 
  AND token = 'OyADu7zjwzkpNJK5n7wUc6xXtM1VZssIfWd7wMlfkyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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