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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fce91ece62ee6785af2b1fd0e1ed6e0280a6bac2c07b768ef0b6e474700b67e2' 
  AND token = '3unRYHYd+QB/JI33kDMFzRwM+pW+ChH5nxmzv92vdbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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