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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bff4f0017c090d06f225dc61f4c588c566f83032ad641fa99a920452f8b86832' 
  AND token = 'E0/fhdVtPkgWOsWJDc8EEIeiuTc6zEJJJhh9iCCpovs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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