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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70baad3cbfdb301de850ab643fcedd44e8b35a9f7b88eb00761b7c4c810e9f23' 
  AND token = 'aPrSjGBiJnOMrlHaH9Wy/Cbv1PQgjj8CneM8hHYuhUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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