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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b9ac780abee8ecc7c8196b7d55aa9ed44e7c8e8dfe4eea9b45bdd7c073444f8' 
  AND token = 'O63NMHrlhrDTm8/2ThKcgkhqbV9GUKH0VssoFrIpraI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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