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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6884b2b3b49623db6b8dfcf5654a9aa29de11e8db594d67a84512e023ff1ad4' 
  AND token = 'z77EU3pCSAs42H2l1wlcjtKQ1OuRyb3yb8JCrKrbkLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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