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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94181e4ae22ede9125322ef59ed8caa5486328c9fbcba31d8a9f0c933ea403e6' 
  AND token = '2DzIliUvhsCJGfRBX/EHtzA47e+1bKEuaLfs2htnWeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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