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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc98d99d4f8ff8b6183ed55a1a6fe4f8a6b4625df63b972b1a28a26b6d0b446c' 
  AND token = 'UVgsQiO6cwIayotLvFdhrgeo+zmWTBSH863dmE+1rIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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