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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc8071de9de5f32916a8496184d239a09fc86a99730ccab20e423a1067545b61' 
  AND token = 'mLdILBtMyMbwmnODnDD9xE4AoRqz9+8LIdsKuexteJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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