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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97e37612496b6a5cff4ec79f97adfa1881d7d9484eece4bcecb626ad63a55065' 
  AND token = 'kZN9IesdM+knYuaFjPrxt6MtmHDP2Ih5662SeHOOmew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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