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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3cbf73dd31eb55ca50cab504286133a6ea11c3a3b3f63f998cab5b10fa431bd' 
  AND token = '10bcxSs1bzFcb5M4OhGDKdHog2zZl3GN/hy41pTL61M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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