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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '139bec63dfaca2d8fea417dbc4246ba5347639e6c00a4536dbae3e062bf41c67' 
  AND token = 'PQ//9XWymv9Hl/5ahiaJOzdf+NFrQN6S8VfRltw+4qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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